New safety innovations for automobiles can be impressive. Side-curtain airbags are a great development for protecting people in a side-impact crash, and are standard on many models, including the Chevrolet Impala. Unless you’re driving an Impala in the Enterprise Rent-A-Car fleet, in which case the airbags were never installed in order to save Enterprise $175 per car. This wasn’t really a problem until Enterprise went to sell their used Impalas, and sort of forgot to tell people that the airbags had been removed.